Grind ing-mill



(No Model.) 3 sheets-sheet 1-.

W. D. GRAY 8v R. BIRKHOLZ.

GRINDING MILL.

No 392,726. Patented Nov. 13, '1888.

(No Model.) 3 sheets-sheet 2.

W. D. GRAY 8v R'. BIRKHLZ.

GRINDING MILL.

No. 392,726. Patented Nov. 13, 1888.

Wine-ssa; @Ivwemor/ Y @uw QM "h 310174 @QMQ (NoMoael.) Y sneets-'sheena W. D. GRAY 8v R. BIRKHOLZ.

y GRINDING MILL.

III fihi-WIM iln'rrn Spaarne artnr Ortner,

VILLIAM D. GRAY AND RICHARD BIRKHOLZ, OF MILVVA'UKEE, WTISCONSIN, ASSIGNOBS TO EDWVABD l?. ALLIS & COMPANY, OF WISCONSIN.

GRINDiNGniVliLL.

SPECIFICATION forming part of Letters Patent No. 392,726, dated November 13, 1888.

Application filed January 30, 1858. Serial No, 262,414. (No model.)

To @ZZ whom it 11i/wy concern.-

Be it known that we, l/VILLIAM D. GRAY and RICHARD BIRKHOLZ, of Milwaukee, in the county of Milwaukee and State of 'Visconsin, have invented certain Improvements in Bollenliiills, of which the following is a specication.

Our invention relates to a construction intended more particularly for mills for grinding corn; and it consists in improved devices for sustaining, adjusting, and driving two pairs of rolls and for delivering the material to be reduced to the first and thence to the second pair, as hereinafter more fully explained.

In the accompanying drawings, Figure l is an elevation of our mill looking against the end of the rolls. Fig. 2 is an elevation looking transversely of the rolls with one side in section on the line x of Fig. l. Fig. 3 is a vertical cross-section through the hopper and feed mechanism on the line y y of Figs. 2 and 4. Fig. 4 is an elevation of the same,looking in the direction indicated by the arrow in Fig. 3, with one side in section on the line z z. Fig. 5 is a transverse vertical section through the feed shoe or shaker. Fig. 6 is an end elevation of one of the roll-bearings. Fig. 7 is a side elevation, partly in section, of the same. Fig. 8 is a side elevation, partly in section, of one of the rollfsupporting arms and the rolladjusting mechanism thereon.

Referring to the drawings, A represents the rigid main frame, which may be of any suitable form, with side plates or standards to sustain the bearings and other operative parts.

B B represent two horizontal cooperating grinding-rolls mounted in the top ofthe frame, and CC a second and like pair ofrolls mounted below and to one side of the upper rolls, as shown in Fig. l. Ve commonly arrange the inner roll, C, of the lower pair directly beneath the outer roll, B', of the upper pair, as shown; but a slight variation to the right or left is not material. The arrangement of the two pairs of rolls in the relations specified is of advantage in that it permits a more convenient arrangement of the driving-belts and feed devices, as will hereinafter appear in full.

The rolls B C, one of each pair, are mounted in bearings fixed in the main frame, while the other rolls are mounted in bearings carried by the upper ends of arms D D', which latter are pivoted at the lower ends to the frame in a well-known manner, so that their rolls may be moved to and from their companions.

Each of the roll-bearings is made, as shown at E, Figs. l, 6, 7, and 8, of two half-boxes, c and c, bolted together. On the exterior it is enlarged centrally in spheroidal form that it may rock or tip in its support, and on the un- 6o an arm or tip, e", overhanging the bearing. 7ov

The parts are so formed that after loosening the screw the bearing may be lifted from its place. To this end the recess or cavity is left open on one side and made of such form that Each while the box or bearing receives a firm support on the under and 'outer sides, which receive the pressure of the journal, the box may be readily removed by lifting it upward and outward. In practice this peculiar manner of supporting the boxes is found to be of great 8o advantage,since it permits either roll to be instantly removed from the machine, together with its bearings, without removing the main supports or otherwise disorganizing the machine.

Motion is communicated to the rolls by belts and pulleys in the manner following: A counter-shaft, H, is passed through the base of the machine from side to side and seated in bearings in a pivoted tightening-frame, I. On one 9o end the shaft carries pulleyz' and on the other two pulleys, iandt'i. ThestationaryrollsBand C are provided, respectively, with the overlapping pulleys b and c on the same side of the mill with pulleys i i2.

and C are provided, respectively, with pulleys 1)' and c'. A drivingbelt, T, from any suitable source is passed, as in Fig. 1, over pulley c', under the pulley t' of the counter-shaft, and thence over pulley b', and imparts motion diroo The movable rolls B reetly to the two movable rolls and the counter-shaft. A belt, b2, is extended from the pulley t" of the counter-shaft over the pulley c and drives the lower stationary roll, while a second belt, ci, passes from pulley '17 to pulley I) and drives the upper stationary roll. in connection with this arrangement of beits and pulleys that the placing ot' thelower rolls to one side is of importance, since it permits the belts and pulleys to be operated without interference, although brought into compact form.

For the purpose of accurately adjusting the rolls 'for the grinding operation, and for quickly spreading and closing them when demanded, we adopt the construction represented in Figs. 1,2, and S. The two swinging arms which support the movable roll B are connected by rods b4 to eccentrics b5 on a crossshaft, b,the rot-ation of which will have the effect of moving the arms and carrying the roll B to or -from its companion, the form and arrangement of these parts being essentially the same as in existing mills. Instead, however, of connecting the rod b to the supporting-arm in the ordinary manner We provide each arm D and D'at its upper end with a cup or pocket, d, containing, as shown in Fig. 8, a strong spiral spring, d, Ofiving support to a nut or washer, d2, applied to the end of the rod Z). The spring tends constantly to force the arm D forward and to urge the movable roll toward its fellow.

In order to limit the approach of the rolls to maintain a suitable separation for grinding purposes, we mount in the outer side of the arm a hand-screw, d, the inner end of which bears against the rod Z, as shown. By turning this screw the arm D, and the roll carried thereby is forced positively backward, since the rod 1f* is at its opposite end seated upon and held securely by the eccentric. The rotation of the eccentric in the proper direction serves to carry the arm and roll outward, or, as it is usually termed, to spread the rolls,77 and this without effecting the adjustment of the screw d, the purpose of which is to adj ust the point to which the roll will be advanced by the eccentric and its connections. By adjusting the nut d on the rod the tension oi' the spring, and consequently the inward pressure of the rol1,may be increased or diminished at will. XVe usually construct the cup i in two parts, the lower half being cast upon the arm D and the upperhalii' cast Separately and interlocked with lugs thereon. s

rlhe devices for adjusting the lower roll, C', are in all respects identical with those used on the upper roll, and need not, therefore, be further described. rihe adjusting devices of the lower roll are indicated in Fig. l by the letter c, with exponents corresponding to those of the letter d, respecting like parts in connection with the uppeln roll.

rlhe simultaneous spreading and closing of the upper and lower rolls is effected by means of a hand-lever, K, fixed to the lower eccentric- It is shaft, c", and connected by a bar, 7.', toacrankarm, 7c', on the upper eccentric-shaft, b.

For the purpose of feeding the machine, we provide it at the top with a feed-hopper, L, having on one side a vertically-adjustable feedregulating gate, Z. The bottom of this hopper is formed by an inclined serrated shakingboard, m, lying above the upper roll, secured in the upper part of a shaking shoe or frame, M,which is also provided below the lower rolls with a second and wider inclined board, 111/. The shoe consists, essentially,`of two sheetmetal side plates, m", secured to the edges of the feed-boards and strengthened by suitable cross-bars. rlhe side plates are made of the form shown in Fig. 5, in order that they may project past and beyond the ends ofthe lower rolls, in order to give proper support to the lower feed-board. The shoe is sustained at one side by one or more pendent straps, mt, iixed at their upper ends to the frame, and is sustained at its forward edge by one or more straps or wires, on, secured at their upper ends to the frame, the arrangement being such that the shaker may receive a free motion in a direction transverse toV the rolls, this movement being automatically effected by means oi' two connecting-rods, m, pivoted at one end to the bottom of the shoe and mounted at their opposite ends on eccentrics on a cross-shaft, m7, which receives motion through a pulley thereon by a belt, nf, Vfrom a pulley on one of the shafts of the roll C. The upper feeding-shoe passes below and beyond the delivery-gate of the hopper and delivers the material gradually from the bottom of the hopper upon a stationary de- Hector-board, n,which in turn directs it downward between the upper rolis. The material passing between the upper rolls falls upon the lower feed-board, m', by which it is carried forward and finally delivered between the lower rolls. rlJhus, it will be seen, the single shaker with its two boards or shelves serves to regulate the discharge of material from the hopper to the first rolls and to conduct the product of the first rolls directly to the second pair.

In order to prevent leakage from the hopper behind the shoe, a cleat, Z, is secured against the rear wall of the hopper and arranged to engage over a lip or ilange projecting upward from the top of the shoe.

It will be perceived that the peculiar arrangement of the upper and lower rolls in relation to each other is also advantageous in connection with the double shoe or feeder.

' I-Iaving thus described our invention, what we claim ism l.. In a roller grinding-mill, the combination of the upper pair of rolls, a hopper above the same, a lower pair of rolls to one side of the upper pair, and a reciprocating shoe or shaker having two shelves, the upper shell serving as the hopper-bottom and delivering to the upper rolls and the lower shelf located between the two pairs of rolls and delivering the product of the upper pair to the lower pair.

IOO

IIO

2. In a roller grinding-mill, the combination of two pairs of grinding-rolls located one above the other, a hopper located above the upper rolls, a reciprocating shoe provided with two shelves, m and m', inclining in one direction, the upper shelf located at the bottom of the hopper and above the upper rolls, and the lower shelf located between the upper and lower rolls, said parts combined and arranged lfor joint operation substantially as described.

3. In a roller grindingmill, a roll-support, D, and its holding-rod b", in combination with the spring encircling said rod and acting against the support, the adjustable spring-sustaining collar on the rod, and the adjustable stop mounted on the roll'support and abutting against the end oi the rod to limit the advance ofthe roll toward its companion.

et. In a roller-mill, and in combination with the movable roll-supporting arm, the spring seated therein to urge the roll toward its companion, the rod b4, fixed at one end and passed at the other end through the spring and supporting-arm, the springsustaining collar on the rod, and the sct-screw ci, seated in the arm and abutting againstthe end of the rod, as shown. Y

5. In a roller grindingmill, the improved means for holding, adjusting, and spreading the rolls, consisting ol the movable roll-sup port and the set-screw d3, mounted therein, the spring acting against the support, the holding-rod b4, arranged to abut against the setscrew, the collar on said rod to sustain the spring, and the eccentric to hold and adjust the opposite end of the rod.

6. In a roller-mill, a roller bearing or box, E, having a spheroidal enlargement on the outside, in combination with its support recessed to fit said enlargement and open on one side to permit the upward removal of the bearing, and the screw e, mounted in the support and acting on the bearing to keep it down in place.

7. In a roller grinding-mill, a roller bearing or box, c, having a spheroidal enlargement and a rib, e2, in combination with its support having the opensided recess tted to said boX,

and the overhanging lip, with the upright screw seated in said lip and acting on top of the bearing.

In testimony whereofl we have hereunto set i our hands, this 16th day of January, 1888, in the presence of two attesting witnesses.

WILLIAM D. GRAY. RICHARD BIRKHOLZ. Vitnesses:

THEoDoRE F. VAMBOLD, WM. BANNEN. 

